[linux-audio-user] New box problems...

[Russell Hanaghan]

On Fri, 2004-04-23 at 17:32, Jack O'Quin wrote:
> Russell Hanaghan <hanaghan at starband.net> writes:
> 
> > Have installed Thacs 2.6.5 MM kernel, modprobed "realtime allcaps=1"
> > manually. Installed the regular set of apps also from Thacs recently
> > updated page for 10.0;
> > 
> > Qjackctl
> > Jackit .98
> > Ardour most recent
> > etc,etc,etc.
> > 
> > I can get Jack to fire up no problems but the Xrun callbacks run like
> > crazy!  It seems to do it only on the playback side of the duplex I/O.
> > (tested in options of Qjackctl) Does not appear to do it on Capture.
> > Ardour connects as client etc. Seems fine although I've not tried to
> > record anything yet. Just realized that the only thing I have not set up
> > is "tmpfs" although I did on the last install with the exact same setup
> > and it still did the same thing. 

Just tried messing with some jack parameters...If I set jack to the
following:

jackd -R -t500 -m -dalsa -dhw:0 -r48000 -p256 -n3 -i2 -o2

The extra "period/buffer" seems to do the trick! Must be a picky sound
chip? But Qjackctl reports 8ms latency and without Xruns, I can live
with that for now.

> 
> This will print the tmpdir JACK is using...
> 
>  $ jackd -V
> 
> > Any ideas??
> 
> There are lots of things that can cause xruns.  
> 
> For starters, make sure you're specifying the --realtime (-R) option
> and running `jackstart' rather than `jackd'.  This is required for
> using capabilities as a normal user (modprobe realtime allcaps=1).
> 
> IIRC, Thac's packages may require a command named `jackd-realtime',
> instead.  Someone will correct me if that is wrong.